Corporate travel is an example. In many organisations, you tell someone in the travel department "I need to be in Tokyo for this conference from Tuesday to Sunday, and charge it to this cost code", and they figure out flights, accommodation, etc for you, with minimal input from you.
… 23 hours in Denver later…
My employer does have corporate travel concierge who can actually do this with minimal input. But people do not want that. They think about aspects like, if I have a layover at XYZ, would the vicinity of XYZ be a good place for a few hours of sightseeing, given my own travel preferences and previous sightseeing destinations; and would I still want it if it is an overnight layover at XYZ. Or things like, if I fly via this route, I could squeeze another paid day with zero work expectations while I could rest on the plane / in lounges. Or things like, this particular airline has this particular type of aircraft with far better seats than that particular airline, so I would be happier even if the flight is longer.
Needless to say, all colleagues that I know of (myself included) prefer to book corporate travel themselves, even if from the company's perspective, spending a few hours to do it is much more expensive than having the concierge spend a few hours to do it.
And in many cases having a corporate policy means just adding a few more constraints: it makes the problem more like a logical puzzle and this can nerd snipe people.